Shell遍历文件，对每行进行正则匹配

Shell查看文件的最后5行，并对每行进行正则匹配，代码如下：

#!/bin/sh

pattern="HeartBeat"
tail -n 5 /home/test/log/log_20150205.log | while read line
do
    if [[ $line =~ $pattern ]]
    then
        echo "Match"
    else
        echo "No match"
    fi    
    echo $line
done